Britain's L42A1: King of the Enfield Sniper Rifles - Paperbackby Jeff John (Author) Britain's L42A1 was the last and best of the Enfield sniper rifles. These legendarily reliable and accurate rifles were built on arguably the best of all the WW II sniper rifles fielded in the No. 4 Mk I (T) . 303 and converted to 7. 62x51mm NATO by the Royal Small Arms Factory at Enfield. The L42A1 served from the early 1970s to the mid 1980s before being retired, but because of its reliability in dirty, dusty conditions, it was